Cascade Crew

nonsensekid20 · Posted: Sun Jan 23, 2011 7:25 pm Post subject:

I knew that.. Doh!

aaron_sK · Posted: Sun Jan 23, 2011 7:27 pm Post subject:

If you dig out the diagram for your carb, it will list what port have full vacuum. Otherwise get some pipe fittings.

nonsensekid20 · Posted: Sun Jan 23, 2011 7:28 pm Post subject:

I think the big one on the bottom has full vac. Not sure about that though. Which one on the carb should it hook to? PCV, Power brake, etc?

Holley Street Avenger

aaron_sK · Posted: Sun Jan 23, 2011 9:14 pm Post subject:

Oh, looky here at this clever thing that I have found with one quick search of Holley's database... Rolling Eyes

http://www.holley.com/data/Products/Technical/199R10219-3rev.pdf

Note the images on pages six and seven. Your brakes and crank vent should already be hooked up as indicated. Run the HVAC off of the full manifold port on the bottom front unless you run full vacuum to your distributor.

nonsensekid20 · Posted: Sun Jan 23, 2011 9:23 pm Post subject:

Didn't really think about that... Embarassed

Gotta hand it to you guys. Not really sure what I'd be doin without you. Laughing

aaron_sK · Posted: Sun Jan 23, 2011 9:25 pm Post subject:

Going slower? Shrug

nonsensekid20 · Posted: Sun Jan 23, 2011 9:31 pm Post subject:

Yeahh... hahaha.

So looking at that website, I've had my dizzy adv. in the wrong spot the whole time. It's on a full manifold vac port instead of the timed spark port. That'll make it run a lot different wont it?

aaron_sK · Posted: Sun Jan 23, 2011 9:51 pm Post subject:

If that's where the car likes it, then leave it. Put the HVAC line somewhere else.

nonsensekid20 · Posted: Sun Jan 23, 2011 9:58 pm Post subject:

I'll just swap em so the HVAC can have the full vacuum port.

Off to schucks to get 10' of vacuum line. lol

aaron_sK · Posted: Sun Jan 23, 2011 10:08 pm Post subject:

Don't run the HVAC off of ported vacuum. Rolling Eyes

nonsensekid20 · Posted: Mon Jan 24, 2011 9:09 am Post subject:

The HVAC is on a PCV port right now. I just want to move it to a smaller port.

BigDaddyVu · Posted: Mon Jan 24, 2011 6:04 pm Post subject:

Don't make me post the whole GM service manual on here. any vacuum powered accesory should only be hooked up to the vacuum canister located below the charcol canister which can be viewed from underneath the front driver side fender or the vacuum tree located on intake manifold between carb and dizzy. But if you bought a holly carb or after market intake you may have it blocked off or non existant.

Twilightoptics · Posted: Mon Jan 24, 2011 7:19 pm Post subject:

HVAC needs to be on manifold vacuum.

I've NEVER run into a motor that likes Ported vacuum for spark advance better than manifold..... except the Wankel.

aaron_sK · Posted: Mon Jan 24, 2011 9:02 pm Post subject:

nonsensekid20 · Posted: Tue Jan 25, 2011 8:35 am Post subject:

oh, right. I knew that. haha. Run the vacuum from the full vacuum to the canister, then from the canister to the HVAC. right?

And there is a vacuum in the intake, I have it hooked up to power brakes right now. And I have no PCV. Thats why its just an open spot.

Al Hasse · Posted: Tue Jan 25, 2011 9:04 am Post subject:

From full vacuum, run a line to the canister with a check valve in-line (close to manifold). Anywhere along that line, after the check valve, you can install a tee to run to HVAC.

aaron_sK · Posted: Tue Jan 25, 2011 9:25 am Post subject:

nonsensekid20 · Posted: Tue Jan 25, 2011 10:21 am Post subject:

Ok so what exactly does the check valve do?

aaron_sK · Posted: Tue Jan 25, 2011 10:35 am Post subject:

Keeps the vacuum from being released out of the system once it's been built up. The engine only makes vacuum some of the time, you're just storing it with a one-way valve.

Twilightoptics · Posted: Tue Jan 25, 2011 10:42 am Post subject:

If you are using CANISTER as a term for the EVAP CANISTER, It doesn't get full vacuum.

The RESERVOIR gets full vacuum Tee'd like mentioned several times above.